Pole-changer



D. W. ODIVORNE No Model.)

POLE CHANGER.

No. 260,228: Patented June 27, 1882.

a. PEYEHS. Mlimognpha. wm m. nv c UNITED STATES PATENT @rrrcn,

DAVID w. onroaun, or ELIZABETH, NEW JEnsEY.

POLE-CHANGER.

SPECIFICATION forming part of Letters Patent No. 260,228, dated June 27, 1882,

Application filed January 12, 1882. (No model.)

To all whom it may concern:

Be it known that l, DAVID W. Ottoman, of Elizabeth, in the county of Union and State of New Jersey, have invented an Improvement in Pole-Changers for Electric Circuits, of which the following is a specification.

Devices have been made for changing the direction of current upon telegraph-lines, so as to alternate the polarity and ring bells or give other signals. These have usually been in the form of levers with contact-springs alternately moved into contact.

My improvement is made for alternating the polarity of the currentby a revolving crank and contact-springs, so that very rapid changes can be made and call-bells rung on telephoneinstruments, or other signals given at a dis-- tance.

This improved pole-changer is especially adapted to central offices, where a battery-current can be brought into action in place of magneto-generators that are often employed to pulsate a current on the line.

In the drawings, Figure 1 is a plan of the pole-changer. Fig. 2 is an inverted plan; and Fig. 3 is a section at the line 00 0c, the lever and contact-springs being shown in elevation.

The base a of the instruinent'is composed of wood or other insulating material. In the center is a stud, Z), forming a pivot for the revolving cranharm c, that can be turned by the fingers applied to the handle d.

There are two rings, 0 and f, upon or let into the surface of the base a, and two rings, g and 1., upon the under side of the base. There are also contact-blocks p a upon the surface of a, or inlaid so as to be flush with the surface. The blocks 1) are fastened to the ring g, and the blocks a are fastened to the ring h, and l find it most convenient to employ screws running through the rings and the base, and into the respective contactbloolrs. There are an even number of these contact-blocks arranged in a circle, and alternating p and a, p and a, all around the circle. These blocks may be at equal distances apart, so that the pulsations or the current will be uniform, or they may be in groups of two or more, with longer spaces between them, so that the strokes of the bell or other signal given at the distanee will indicate numbers or particular calls. The spaces between the contact-blocks should be filled with insulating material flush with the surfaces of the blocks.

The crank-arm c is preferably of insulating material, and there are insulating-springs, l m and s 0, upon the said arm, at opposite sides of the pivot on which it is revolved. The springs m 8 run over the contact-blocks p a. The spring 1 rests on the ring 0 and the spring 0 upon the ring f. The spring 8 is longer than the spring m, so that it rests upon a block 1) at the time the spring at rests upon a block a, and the reverse. The binding-post 1 is presumed to be connected to positive pole of battery, and the current passes from that to the ring g, and to all the contact-plates p. The negative pole is presumed to be connected to the binding-post 2, and thence by the ring it with all the contact-blocks a. The line and ground connections are by the rings 0 f and binding-posts S and 1, as indicated in the diagram. When 8 rests on one of the contactblocks 1) the current will be through 1 g p s 0 f 3 to line and return, or negative be from G, 4, c, l, m, a, h, and 2 to battery. lVhen m rests on one of the contact-blocks p the current will be through 1, g, p, m, l, c, andtto ground, and the return or negative be from line by 3, f, 0, s, a, h, and 2- to battery. Hence the circuit is changed each eontactblock that is passed over, and the speed of reversal will depend on the rapidity of movement given to the cranlearm in proportion to the width of the contactplates.

springs Z m 0 8 upon such arm, the rings 6 f and alternating contact-blocks p a upon such Signed by me this 5th day of January, A. I). I0

D. \V. ODIORNE.

Witnesses:

HAROLD SERRELL, GEO. T. PINOKNEY, WILLIAM G. Mo'rrr. 

